Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7eca6e9151f0e8…

MALICIOUS

PDF

73.8 KB Created: 2021-09-05 14:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 92a6b169f14788dbf87a5f37a87c9718 SHA-1: f4ace3ec4bd592184e2ffeccec89e35597f9a655 SHA-256: 0c7eca6e9151f0e8c3dcbe7086a530789b4ef1ce7eeb41eda5bf610bdd48710c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF sample was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of XFA forms and embedded URLs indicates an attempt to exploit PDF vulnerabilities or trick users into visiting malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=morphology+and+anatomy+of+plants+pdf PDF link annotation
    • http://ahlhy.com/uploads/file/110616184380.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611499b649562---49753793395.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/liroda.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/399ec2ef0d3d18c65111adedf0b548da/xopivaxa.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16092a5e1f184c---18354058518.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/at5u7m5o7i0k6koaterr4evt2g/warerasimimatavifu.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/07bcc9bd9c491b18c2bbb40122962c44/40512266982.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e61450d0ef1---32129400805.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d06e1fea21b4b3febf79932c1075f220/vibiwemevoxegudikewe.pdfIn PDF document text
    • http://chpcentre.com/files/file/96354553321.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/a1fi5trljtfsa0l3t29obhjd5s/32986811184.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/fufidegifurifotavez.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/zujevek.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/gidofelatozumoguropaxe.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/8j81k5rgdi9gsmauhuaf4aed6r/nedidepoxixewol.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4255690b1---budumurewesenilawogera.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/dd0466c944d7e6f87c2fe8988caf4bdc/pijifidokekoxa.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/8423802575.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f472cec3b7---jexirosivexodirag.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/68996672615.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/86640536302.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/30933085766.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/55130564521.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06A 15916 bytes
SHA-256: cdaf6fefd4b3973f9833b65389139cd39a34eda2d2ea6aa085acc29afa3c6c2f
font_01_sfnt_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 10828 bytes
SHA-256: 9918528ae987a711236153a6a76910e4557244894f5a9c4159ae9e95c090dcd4
font_02_sfnt_off000101ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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